Mercurial > hg > graal-jvmci-8
view src/share/vm/utilities/histogram.cpp @ 1837:c99c53f07c14
6692906: CMS: parallel concurrent marking may be prone to hanging or stalling mutators for periods of time
Summary: Inserted missing yield(check)s in closures used during the work-stealing phase of parallel concurrent marking, a missing synchronous yield-request in the cms perm gen allocation path, and a terminator-terminator for the offer_termination invocation that monitors the yield status of the concurrent marking task. Elaborated some documentation comments and made some task queue termination loop flags configurable at start-up to aid debugging in the field.
Reviewed-by: jmasa, johnc, poonam
author | ysr |
---|---|
date | Wed, 29 Sep 2010 16:17:02 -0700 |
parents | c18cbe5936b8 |
children | f95d63e2154a |
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/* * Copyright (c) 1998, 2004, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. * */ # include "incls/_precompiled.incl" # include "incls/_histogram.cpp.incl" #ifdef ASSERT ////////////////// HistogramElement //////////////////////// HistogramElement::HistogramElement() { _count = 0; } int HistogramElement::count() { return _count; } const char* HistogramElement::name() { return _name; } void HistogramElement::increment_count() { // We can't use the accessor :-(. Atomic::inc(&_count); } int HistogramElement::compare(HistogramElement* e1,HistogramElement* e2) { if(e1->count() > e2->count()) { return -1; } else if(e1->count() < e2->count()) { return 1; } return 0; } void HistogramElement::print_on(outputStream* st) const { st->print("%10d ",((HistogramElement*)this)->count()); st->print_cr("%s",((HistogramElement*)this)->name()); } ////////////////// Histogram //////////////////////// int Histogram::sort_helper(HistogramElement** e1, HistogramElement** e2) { return (*e1)->compare(*e1,*e2); } Histogram::Histogram(const char* title,int estimatedCount) { _title = title; _elements = new (ResourceObj::C_HEAP) GrowableArray<HistogramElement*>(estimatedCount,true); } void Histogram::add_element(HistogramElement* element) { // Note, we need to add locking ! elements()->append(element); } void Histogram::print_header(outputStream* st) { st->print_cr("%s",title()); st->print_cr("--------------------------------------------------"); } void Histogram::print_elements(outputStream* st) { elements()->sort(Histogram::sort_helper); jint total = 0; for(int i=0; i < elements()->length(); i++) { elements()->at(i)->print(); total += elements()->at(i)->count(); } st->print("%10d ", total); st->print_cr("Total"); } void Histogram::print_on(outputStream* st) const { ((Histogram*)this)->print_header(st); ((Histogram*)this)->print_elements(st); } #endif